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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0b67c514aff3e9e65c445d452046c74bc3ec7828fd4b1e793831a3c70030e9' 
  AND token = 'FqMtEbB2Yn7KR4m4oN8y6hhexmpRqberERR6VsLiK1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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