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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81258d8372474c22a1288d021f6092491078e89e872b012fced777d628cec81a' 
  AND token = 'fCmP/s1dNWgAHNx2bqWtsq8GlqHR5xV6+cmcCSJunlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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