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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6737b419afa5896de90567d33a1265152791f43de861547258b130b9e0a7194b' 
  AND token = 'vEKw+6R9DmH4atAabCdmNX7OrdrgoixGIY4lGdv/jGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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