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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5238a577ea6b30f56ae007a1c359aa63626fc1923f6f1426714e1e369520a0' 
  AND token = 'ruLnlv/jO3zek4Oz8jmzYJlNp/Lb9kTKGyl1dn+ZAEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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