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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94f6800fed848c13f9a057989e0815476d1e6f6efabc38a867bb1ea5d0ccf39' 
  AND token = '+6On6LphfzppqJ6avmzu6DH6XHCpSFHg+Pxesbju8TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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