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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3134b343023ff0003de12e7e42fb5f2973020cfea12e6a8abaf2a6953654bf' 
  AND token = '6BYhQo13cy5rvTrbZ2T4C+891OY/R9/pey8nEGyMEwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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