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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bfc968eb2a328f046a0544d5178591d7c16cf1c52ded7a7b030f176a6392ba' 
  AND token = 'oj5JUIL0Dxv9Sa3lXRdGUBrK/GHgUSvxPfQ3fLXg6S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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