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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71316099d9575c8801c9282e27ed76117a6099fe81f9456bc46c04c75ee4b1bb' 
  AND token = 'nhpH9VFowU9IL3IV94/MiQ1CXvE3sgwYTzccJDElZV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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