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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634df130280b990f6c2c359c3e72b59b435e74598cd5c62fd8eeb192be264ee0' 
  AND token = 't8M3TFKTe8mfQ2Ob8F5tVqbR8doPzSg2dIJXFDcHdu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}