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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208e066f068ed5634e5f01be7734a1aaf5838e42d1f44fb05d08931c8f242aee' 
  AND token = '9cWe8Rhj7kLKI75W7WqXzghdWeCQ0STunq2QZPO1DXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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