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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d38a8537cff1e637dda58b72352045ded7809fb7abc1c122fe3d47383f302b' 
  AND token = 'nTvdkoYK6gTZGQKQK1U1L8FFfAAVp87lGxZwYeT6M98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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