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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7fe9ad7e92dbb4a74a9dde980c63b7fa3f2ea6ebf7309ac32943dfafab2c5e' 
  AND token = 'zba/4UuGlEjfGTBM9ZMKtVv5K72F30wWwGz3tRLWDm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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