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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91d01517794cdaee1f4fd53968bc7d952ecc346f0a5a318e1a9b1ca11eb6cb0' 
  AND token = '+S9ABVxwcm9w1+HQ+UQXNoVC/7C/8Lq7B8H2yturjSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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