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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218888b51d7b2b4e729cdb816b03d8f3e6e502962fbafb19616c0698dcdc46aa' 
  AND token = 'fRTgYmyGy8zsVekL0+fKbUDC0CEZKGsSzwLTh43YKb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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