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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814e358d6c39ef9f0be68f3a950e90c1dbf75e2e2eb4784d5759eb711867632d' 
  AND token = 'wU37iTzWggMgf+PdEmxOIDmIvOz+rH6DbVP09rcbRLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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