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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9397de9808e7d1779c4b5d17bd514e283e68a11e65562165871e6522d0c9183d' 
  AND token = 'WW+q4SEK+Mezuq2i+jgNR7TwR+Dhild1siymfxqLnXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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