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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37578565fa86866cd1ce4b9390866bd9dba16fcc7a1ded4662a696e93957da45' 
  AND token = 'z/ND6xC6zNnnQyRq03yd81kxMs2ntLV3WjRcqNueT0I=' 
  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"
    }
  }
}