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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fb00fef83b34e2cb574e3f31a5af15bfc6c8eb71ec5ca7130c97e9e082a0d5' 
  AND token = 'uxFvAgWC8C5uPHxdjRDagGdxaKZ0F7p5G6uvS6gvpn8=' 
  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"
    }
  }
}