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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9beb3870353f8062ae9e66ee3fc4c656f77c90d9ce46e8a30a21c132c1f7aa0e' 
  AND token = 'JYEOWGiAWSdtLzAxwX7Q1rsP9NTG67hPMwRl8uR+iT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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