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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70a067bc5e259b2f69e6dd75c575c3f9ee0e7e6e3ec9b97e4988771986551aa' 
  AND token = 'n3IX8A2f6querSWTZUi97eNURMVp8v0Q8qsjrxOPRAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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