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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765bf0c8e97609778cb0b553fe26e6a397c9a8a2b72f795aceb135e005b6d30e' 
  AND token = 'ckYicHce3lBILNXsce+Rki8sJkbocY9p504chVAub/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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