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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4a35012983ea12aed094f88f2bd41dfa6c52f6d75c464ef548ef40625a47bd' 
  AND token = '8GW9BCmim9Qh10ihh/N3UaYdA0ncXUbrctudn9PMGBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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