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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a17c6600708a7a8ebbda0f4420f1745e2cf52ddf7072e7fb083bfc8a52f9abb' 
  AND token = 'SXWeh1BPD/uB9sTo4N8EDOc/mmIGLB6D5LdUxzOjYs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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