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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe859834b94ff0ccc35f4fb8b0f0f27c864b9a98b95faec87b665b771ee28934' 
  AND token = '66rkkF4YLOlWzwgJ3byrxUOwRQW+6Bld9+q1wf+FNB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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