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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bea8ef65d2d6d25a1edb24e0aba3581790883593a289565ea62d0b8ca2dd4b2' 
  AND token = 'NGa1k2TWRWSaOcGuQK8MEOjok+ngcCT7tTSQxvvA3m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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