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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e16ec98efc1f1cfba57b3398c9fb1c16ecd6c853fa9f5b52656ca9d03b1f8b2' 
  AND token = 'LxBUn2AtV0F+kfihAG4I7a0BVxtCsZh8+DHf3aU3s/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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