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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac87a37ef3c8ea1403a90a67c0d15562d2693273e1997afac27a252d74da6955' 
  AND token = '9FNh5WtGJoI7oweaqvES1nsXCMs/pbml0D8bkRjVow4=' 
  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"
    }
  }
}