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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0ea51a1d9bf61c347514e8ca7971d904dd7e1ce62f44c8a5d776b0e24985ce' 
  AND token = 'ZJuCr2DFteZEEfs03jIKcSsK4Lne6FlLhVtLyWjxmbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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