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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e62e20bb0a798b499f85742411339f8e3190077df3f3ab43d8bd7401e5ecfee' 
  AND token = '/qWB9aava7Rvs2OgrmnhnPM3+9j8fHiTh06rvh32wAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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