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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806ae1c537657bf09277e6b0652f1a3afe50c8a4f13705ca1341621646fb78da' 
  AND token = '4ZbHJhgcknGrq9z7vfFglMu0huKthk5gw0xNTVyfI6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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