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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9208608828712e1c3a70df5e081229cbd560ad8135d57f41bcb794e90936db4a' 
  AND token = 'hOfVOcuj5bqda29D4/QLlm3DGoikncjc5LLZOuOf7F4=' 
  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"
    }
  }
}