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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e1ea43c6886688454a1dbf4dd9f8de9570c224286b14e4cbf06bddd3ed7149' 
  AND token = 'Mjk7nbLWrn1sW7GdLI2xC0vYgjxA1MuomkBLoZZ9OQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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