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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eaefb74d171d7c0aeb9a86fcb1d37a3c8d0ec80b9de3fd8abc3bef406a10d4e' 
  AND token = 'IJggNe57BZXA4rTWoPXXIWc0Mm0SxiSiw6fxQ70VHqE=' 
  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"
    }
  }
}