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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15a149ef4fc2cecc86a1ce9f4820a39ff7aefa7f3c3c9d85fa935e0be127df9' 
  AND token = '7l+CQCtVs3ksK744zBlufnLt0x7qupSMxezWyc/jL4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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