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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7b1482d6d5a1449db3245a6e04214104e2f7226816fe879ec55dea99d111dc' 
  AND token = 'eHYu9yRLCGqCOT4fNvday7AyTzpw+2k+qtZDz2Jb1nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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