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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb107f15fefd6b1d82c091c48c840564a03b7860de941411bbef437c692d0df5' 
  AND token = 'y1zbJAdUxmWRHMi2CmaPQdvJr/TI8lFTqZ3mxpNIaZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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