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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b33c2856c3775fcfe89ba42015a3397e3328f7eb276b2bf54d166f08a6e3ea' 
  AND token = 'cBwHPEGUptqn616cFbiMYrO7HQ6m8wpOCppw4Sk6YSc=' 
  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"
    }
  }
}