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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0478655058376e88b24f71a61a77513e344d5436de82acdf8a40a7ac439f2e98' 
  AND token = 'RlPD0wtk+IdhNVdlkEi8ui2Buet3aJo1poXT6s1z6sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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