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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5839a3a1e98ee37235a654da7e63d7b3b28cada77c83bb2d01aa4918734d880a' 
  AND token = 'NprzGk4YW18GFovy2Y5VX4y556PAVxyWKWg73ut0+HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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