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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7875fa16f8e70bf1f88645ea3991df40418cd70305c9e19a4c268e5e0f34c6d3' 
  AND token = 'B92qaT3AWjBqweDkuPiaSyTojfc6SBG0gbTkxJDQWqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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