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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0f71c8b878012a945b5ffa22fefdc26cd0a3d262db7549d71b144f5788ad9e' 
  AND token = 'XJrLGAZWN8ekBrOfpaWQmLW1VyxydwQ00dq2Diix0oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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