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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c9e22089780a7dc8577d336bd9eddf76d2ac172302e4e705a71922de476b67' 
  AND token = 'bN5LGdD6S9/hOrp8GNqcyUV5lzgxQC2HCacQ7/sJtNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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