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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed352ca5856983e1f817b10f03c9d44f6174beb8ec5a0d3997347fa6601353e' 
  AND token = 'ILlW7008wyHFrx/S/98I2lUjBmoB1Ls9hCHIeeO2X9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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