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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4af344c1892f7472f8d658c5a1f33d457669e6e0c5325ef21fd758f2b6b64e' 
  AND token = 'EZDQt7oLI8ecpfehLy4WPWo0Ert/n9Y+AflkJJWnkWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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