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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6f4ca08b5704da1a4b1a6cf29138c43a983a0a138c57a823549849d74b1ebf' 
  AND token = 'G3wYdfmi6CgXNZGO2I91Qf1H1pZ52qHN4Bx9YXVzhAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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