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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae6135e3dc700cf163b45fae401a6d87cc656c23377a1b766114e7c36930c81' 
  AND token = '+L6RLy6cVF5eor27rh5kzHAPDHxsqG5eNDFCQkMw8ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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