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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a0b2f544e2ac824acc3cc507dc4d102ef67873780a50c8a58b14a8a4acabb7' 
  AND token = 'GUMGDGvdTEQYofAi1UMRt1iKD2OuqTqNVRd3niiNOyY=' 
  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"
    }
  }
}