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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c27f36058930b6768b29f0b021ef451c7c497ac5d2f7ca2d1bec2a9b2d10d0' 
  AND token = 'X46r9LACujF8HZoaX1+WVyId55y/FjcyiKbnIJCIr8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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