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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160ee37925193b825e23cebddf93733c6b45be401e2c7abf5916e9d024c36af3' 
  AND token = '4gCDq1QAYooXGStkWBXAAkafxVKFbqhoMWHj9CBzsYM=' 
  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"
    }
  }
}